Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
  • B29C53/80—Component parts, details or accessories; Auxiliary operations
  • B29C53/84—Heating or cooling
  • B29C53/845—Heating or cooling especially adapted for winding and joining
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/06—Fibrous reinforcements only
  • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
  • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/28—Shaping operations therefor
  • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
  • B29C70/32—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core on a rotating mould, former or core
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/28—Shaping operations therefor
  • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
  • C08J5/241—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using inorganic fibres
  • C08J5/243—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using inorganic fibres using carbon fibres
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
  • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
  • B29C35/0288—Controlling heating or curing of polymers during moulding, e.g. by measuring temperatures or properties of the polymer and regulating the process
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
  • B29C53/56—Winding and joining, e.g. winding spirally
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
  • B29C53/80—Component parts, details or accessories; Auxiliary operations
  • B29C53/8008—Component parts, details or accessories; Auxiliary operations specially adapted for winding and joining
  • B29C53/8066—Impregnating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
  • B29K2101/10—Thermosetting resins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2663/00—Use of EP, i.e. epoxy resins or derivatives thereof for preformed parts, e.g. for inserts
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
  • C08J2333/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
  • C08J2333/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
  • C08J2333/10—Homopolymers or copolymers of methacrylic acid esters

Definitions

• the present invention relates to a sheet winding molding method having excellent productivity.
• a fiber-reinforced resin composite material which is reinforced with a reinforcing fiber, such as a carbon fiber or a glass fiber, has excellent heat resistance and mechanical strength despite being lightweight, and has attracted attention due to such advantageous features, and the use of the fiber-reinforced resin composite material in various structure applications, such as bodies and other members for automobile and aircraft, is expanding.
• a molding method for the fiber-reinforced resin composite material for example, a method is employed in which, using an intermediate material called a prepreg, which is produced by impregnating a reinforcing fiber with a thermosetting resin, the prepreg is cured and molded by autoclave molding, press molding, or winding molding. Particularly, when obtaining a molded article in a cylindrical shape, winding molding is conducted.
• the resin for use in a prepreg be a resin having both stability and curability by heating or the like, and hence, generally, as a resin for a prepreg, thermosetting resins, such as an epoxy resin composition, are widely used (see, for example, JP2015127386 A ).
• Document JPH02113927 discloses a sheet winding molding method according to the preamble of claim 1.
• the prepreg using the epoxy resin composition has a problem in that it has stability but is cured slowly. Further, when winding molding is conducted for the prepreg using the epoxy resin, a problem is caused in that, when the prepreg is cured at a high temperature after winding, the viscosity is lowered, so that the arrangement of fibers in the prepreg is disordered due to relaxation of the residual tension caused by winding, leading to a poor strength.
• a task to be achieved by the present invention is to provide a sheet winding molding method which is advantageous not only in that the method has excellent productivity, but also in that a molded article having excellent physical properties, such as excellent interlaminar shear strength, can be obtained by the method.
• a sheet winding molding method comprising winding a thermosetting prepreg around a substrate under specific conditions is advantageous not only in that the method has excellent productivity, but also in that a molded article having excellent physical properties, such as excellent interlaminar shear strength, can be obtained by the method, and the present invention has been completed.
• the present invention is directed to a sheet winding molding method including winding a thermosetting prepreg around a substrate while heating the thermosetting prepreg, wherein the time taken to form a next layer of the thermosetting prepreg on a layer of the wound thermosetting prepreg is shorter than the gel time of the prepreg at the temperature of the wound thermosetting prepreg.
• the molded article obtained by the sheet winding molding method of the invention has excellent interlaminar shear strength and the like, and therefore can be advantageously used in members for automobiles, members for railway rolling stocks, members for aircrafts and aerospace vehicles, members for vessels, members for housing and related facilities, members for sports, members for light cars, members for construction and civil engineering, and housing for OA machines and the like .
• the sheet winding molding method of the invention includes winding a thermosetting prepreg around a substrate while heating the thermosetting prepreg, wherein the time taken to form a next layer of the thermosetting prepreg on a layer of the wound thermosetting prepreg is shorter than the gel time of the prepreg at the temperature of the wound thermosetting prepreg.
• thermosetting prepreg having excellent curing properties is wound around a substrate while the thermosetting prepreg is heated, so that curing proceeds simultaneously with the winding, which can eliminate the need for a curing step after the winding and provide excellent productivity. Further, the arrangement of fibers in the prepreg is prevented from being disordered due to relaxation of the tension, which makes it possible to obtain a molded article having excellent interlaminar shear strength.
• prepreg lamination time is shorter than the gel time of the wound thermosetting prepreg, and therefore a molded article having excellent adhesion between the layers and excellent interlaminar shear strength can be obtained.
• thermosetting prepreg contains a thermosetting resin composition and a reinforcing fiber.
• thermosetting resin composition preferably contains a radically polymerizable resin and a polymerization initiator.
• radically polymerizable resins examples include epoxy (meth)acrylate, urethane-modified epoxy (meth)acrylate, urethane (meth)acrylate, and an unsaturated polyester, but, in view of further improving the curing properties and the interlaminar shear strength of the molded article obtained, preferred is urethane-modified epoxy (meth)acrylate or urethane (meth)acrylate.
• epoxy (meth)acrylate urethane-modified epoxy (meth)acrylate, urethane (meth)acrylate, and an unsaturated polyester, but, in view of further improving the curing properties and the interlaminar shear strength of the molded article obtained, preferred is urethane-modified epoxy (meth)acrylate or urethane (meth)acrylate.
• These radically polymerizable resins can be used individually or in combination.
• an urethane-modified epoxy (meth)acrylate which is obtained by reacting an epoxy (meth) acrylate having an average hydroxyl group number of 1.8 to 2.6 per molecule and a polyisocyanate having an average isocyanate group number of 2 to 3 per molecule.
• the epoxy (meth) acrylate can be obtained by reacting an epoxy resin and (meth)acrylic acid and/or (meth)acrylic anhydride with each other.
• an epoxy resin and (meth)acrylic acid and/or (meth)acrylic anhydride with each other.
• a method of obtaining the epoxy (meth) acrylate having an average hydroxyl group number of 1.8 to 2.6 per molecule there can be mentioned a method in which the average hydroxyl group number of the epoxy (meth)acrylate per molecule is controlled by appropriately setting the average epoxy group number and average hydroxyl group number of the epoxy resin and the molar number of (meth)acrylic acid and/or (meth)acrylic anhydride during the reaction.
• epoxy resins examples include bisphenol epoxy resins, such as a bisphenol A epoxy resin, a bisphenol F epoxy resin, a bisphenol fluorene epoxy resin, and a biscresol fluorene epoxy resin; novolak epoxy resins, such as a phenolic novolak epoxy resin and a cresol novolak epoxy resin; an oxazolidone-modified epoxy resin; glycidyl ethers of phenol, such as brominated epoxy resins of the above resin; glycidyl ethers of a polyhydric alcohol, such as dipropylene glycol diglycidyl ether, trimethylolpropane triglycidyl ether, diglycidyl ether of an alkylene oxide addition product of bisphenol A, and diglycidyl ether of hydrogenated bisphenol A; alicyclic epoxy resins, such as 3,4-epoxy-6-methylcyclohexylmethyl 3,4-epoxy-6-methylcyclohexan
• a bisphenol epoxy resin, a novolak epoxy resin, or an oxazolidone-modified epoxy resin is more preferred, and further, from the viewpoint of obtaining a cured product having excellent balance between the interlaminar shear strength and the mechanical strength, a bisphenol epoxy resin or an oxazolidone-modified epoxy resin is more preferred.
• the epoxy equivalent of the epoxy resin is preferably 150 to 400 from the viewpoint of the heat resistance and curing properties.
• the above-mentioned reaction of an epoxy resin and (meth)acrylic acid is preferably conducted using an esterification catalyst at 60 to 140°C. Further, a polymerization inhibitor or the like can also be used.
• a polyisocyanate having an average isocyanate group number of 2 to 3 per molecule but, for example, an aromatic polyisocyanate, such as diphenylmethane diisocyanate (of a 4,4'-form, a 2,4'-form, or a 2,2'-form, or a mixture thereof), modified diphenylmethane diisocyanate, e.g., a carbodiimide modification product, cyanurate modification product, biuret modification product, or urethane-imine modification product of diphenylmethane diisocyanate, or diphenylmethane diisocyanate modified with a polyol having a number average molecular weight of 1,000 or less, such as diethylene glycol or dipropylene glycol, tolylene diisocyanate, tolidine diisocyanate
• the molar ratio (NCO/OH) of the isocyanate group (NCO) of the polyisocyanate to the hydroxyl group (OH) of the epoxy (meth)acrylate is preferably in the range of 0.6 to 1.1, more preferably in the range of 0.7 to 1.0.
• urethane (meth)acrylate which is a reaction product of a polyisocyanate compound produced from polymethylene polyphenyl polyisocyanate as an essential raw material and a compound having a hydroxyl group produced from a compound having a hydroxyl group and (a)an (meth)acryloyl group as an essential raw material.
• n is an integer of 1 or more.
• Examples of the compounds having a hydroxyl group and (a)an (meth)acryloyl group for the urethane (meth)acrylate include a hydroxyalkyl (meth)acrylate and epoxy (meth) acrylate. These compounds having a hydroxyl group and (a)an (meth)acryloyl group can be used individually or in combination.
• the molar ratio (NCO/OH) of the isocyanate group (NCO) of the isocyanate compound to the hydroxyl group (OH) of the compound (a2) having a hydroxyl group, which compounds are raw materials of the urethane (meth)acrylate (A), is preferably 0.1 to 1.5, more preferably 0.3 to 1.2.
• an organic peroxide is preferred, and examples of organic peroxides include diacyl peroxide compounds, peroxyester compounds, hydroperoxide compounds, ketone peroxide compounds, alkyl perester compounds, percarbonate compounds, and peroxyketals, and a polymerization initiator can be appropriately selected from these compounds according to the molding conditions. These polymerization initiators can be used individually or in combination.
• a polymerization initiator having a temperature of 70 to 100°C at which a 10-hour half-life is obtained because the resultant prepreg has a long life at room temperature and further suffers curing due to heating in a short time.
• polymerization initiators examples include 1,6-bis(t-butylperoxycarbonyloxy)hexane, 1,1-bis(t-butylperoxy)cyclohexane, 1,1-bis(t-amylperoxy)cyclohexane, 1,1-bis(t-hexylperoxy)cyclohexane, t-butyl peroxydiethylacetate, t-butylperoxy isopropyl carbonate, t-amylperoxy isopropyl carbonate, t-hexylperoxy isopropyl carbonate, di-tert-butyl peroxyhexahydroterephthalate, t-amyl peroxytrimethylhexanoate, and t-hexyl peroxy-2-ethylhexanoate.
• thermosetting resin composition preferably contains an ethylenically unsaturated monomer.
• ethylenically unsaturated monomers examples include styrene compounds, such as styrene, methylstyrene, halogenated styrene, and divinylbenzene; monofunctional (meth)acrylate compounds, such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, cyclohexyl (meth)acrylate, isobornyl (meth)acrylate, benzyl (meth)acrylate, methylbenzyl (meth)acrylate, phenoxyethyl (meth)acrylate, methylphenoxyethyl (meth)acrylate, morpholine (meth)acrylate, phenylphenoxyethyl acrylate, phenylbenzyl (meth)acrylate, phenyl methacrylate,
• monofunctional (meth) acrylates having a molecular weight of 150 to 250, more preferred are phenoxyethyl (meth)acrylate, methylphenoxyethyl (meth)acrylate, benzyl (meth)acrylate, and methylbenzyl (meth)acrylate, and further preferred are phenoxyethyl (meth)acrylate and benzyl (meth)acrylate.
• the reinforcing fibers include a carbon fiber, a glass fiber, a silicon carbide fiber, an alumina fiber, a boron fiber, a metallic fiber, and organic fibers, such as an aramid fiber, a vinylon fiber, and a Tetoron fiber, but, in view of obtaining a molded article having higher strength and higher elasticity, preferred is a carbon fiber or a glass fiber, and more preferred is a carbon fiber.
• These reinforcing fibers can be used individually or in combination.
• thermosetting prepreg a unidirectional material obtained by unidirectionally arranging reinforcing fiber tow or a material obtained by laminating the unidirectional material on one another, knitted fabric, nonwoven fabric formed from a short cut reinforcing fiber, or the like can be used.
• lamination constructions of the unidirectional prepreg include 0°, (0°, 90°), (+45°/0°/-45°/90°), and (+60°/0°/-60°).
• thermosetting prepreg preferably has a thickness in the range of 0.02 to 1 mm, more preferably 0.05 to 0.5 mm.
• thermosetting prepreg preferably has a width in the range of 100 to 2,000 mm, more preferably in the range of 300 to 1,500 mm.
• the gel time of the thermosetting prepreg at 150°C is in the range of 15 to 60 seconds.
• the gel time and cure time of the prepreg are measured by means of CURELASTOMETER 7 TYPE P (manufactured by JSR Trading Co., Ltd.).
• the speed of winding the thermosetting prepreg around a substrate is controlled so that the prepreg lamination time is shorter than the gel time of the thermosetting prepreg, but, in view of further improving the productivity and the interlaminar shear strength of the molded article obtained, the winding speed is preferably in the range of 8 to 850 mm/second, more preferably in the range of 15 to 400 mm/second.
• the prepreg lamination time is preferably in the range of 1 to 90 seconds, more preferably in the range of 1 to 60 seconds.
• the temperature of the wound thermosetting prepreg is preferably in the range of 80 to 160°C, more preferably in the range of 110 to 160°C, further preferably in the range of 120 to 150°C.
• the temperature of the thermosetting prepreg in the invention is a temperature as measured with respect to the surface of the prepreg by means of a thermocouple-type thermometer.
• thermosetting prepreg there is no particular limitation, but, from the viewpoint of facilitating heating of the thermosetting prepreg, preferred are contacting the prepreg with a heated substrate, contacting the prepreg with a heating roll, contacting the prepreg with a heating plate, and heating the prepreg using an infrared heater, microwaves, or a halogen heater.
• the substrate around which the thermosetting prepreg is wound is preferably a substrate in a cylindrical shape, such as a tank or a pipe.
• the circumferential length of the substrate is preferably in the range of 30 to 3,000 mm in view of more easily controlling the winding speed.
• thermosetting prepreg In view of further improving the interlaminar shear strength of the molded article obtained by the sheet winding molding method of the invention, it is preferred that, after winding, heating is continued until the cure time of the thermosetting prepreg has elapsed.
• the molded article obtained by the sheet winding molding method of the invention has excellent interlaminar shear strength and the like, and therefore can be advantageously used in members for automobiles, members for railway rolling stocks, members for aircrafts and aerospace vehicles, members for vessels, members for housing and related facilities, members for sports, members for light cars, members for construction and civil engineering, and housing for OA machines and the like .
• thermosetting resin composition (1) Into 100 parts by mass of a resin liquid, which had been preliminarily obtained by mixing together 75 parts by mass of the above-obtained epoxy methacrylate (1) and 25 parts by mass of phenoxyethyl methacrylate, were mixed 0.02 parts by mass of parabenzoquinone and 1 part by mass of a polymerization initiator ("Trigonox 27", manufactured by Kayaku Akzo Corporation; organic peroxide), and then 28 parts by mass of 4,4'-diphenylmethane diisocyanate was mixed with the resultant mixture to obtain a thermosetting resin composition (1) .
• Trigonox 27 manufactured by Kayaku Akzo Corporation; organic peroxide
• thermosetting resin composition (1) A carbon fiber ("TC-36P", manufactured by FORMOSA PLASTIC CORPORATION) was impregnated with the above-obtained thermosetting resin composition (1) using a prepreg producing apparatus so that the volume content of the carbon fiber in the resultant prepreg became 60% to obtain a thermosetting prepreg (1).
• the obtained thermosetting prepreg (1) had a thickness of 0.09 mm and a width of 300 mm. Further, the gel time at 150°C was 25 seconds, the gel time at 146°C was 29 seconds, and the cure time at 146°C was 49 seconds.
• thermosetting resin composition (2) 100 parts by mass of a mixture of polymethylene polyphenyl polyisocyanate and diphenylmethane diisocyanate ("Millionate MR-200", manufactured by Tosoh Corp.; polymethylene polyphenyl polyisocyanate content: 56%; hereinafter, referred to simply as "polymeric MDI mixture (1)"), 75.5 parts by mass of hydroxyethyl methacrylate, 15 parts by mass of pentaerythritol polyoxyethylene ether (“PNT-40", manufactured by Nippon Nyukazai Co., Ltd.), 21 parts by mass of phenoxyethyl methacrylate, and 2 parts by mass of a polymerization initiator ("Trigonox 27", manufactured by Kayaku Akzo Corporation; organic peroxide) were mixed with one another to obtain a thermosetting resin composition (2).
• Millionate MR-200 polymethylene polyphenyl polyisocyanate and diphenylmethane diisocyanate
• PNT-40 pen
• thermosetting resin composition (2) A carbon fiber ("TC-36P", manufactured by FORMOSA PLASTIC CORPORATION) was impregnated with the above-obtained thermosetting resin composition (2) using a prepreg producing apparatus so that the volume content of the carbon fiber in the resultant prepreg became 60% to obtain a thermosetting prepreg (2).
• the obtained thermosetting prepreg (2) had a thickness of 0.09 mm and a width of 300 mm. Further, the gel time at 150°C was 19 seconds, the gel time at 146°C was 21 seconds, the gel time at 120°C was 70 seconds, the gel time at 116°C was 76 seconds, the cure time at 146°C was 43 seconds, and the cure time at 116°C was 105 seconds.
• thermosetting prepreg (1) having a width of 300 mm obtained in Production Example 1 was wound 30 times around a pipe having a diameter of 100 mm and a width of 500 mm at a temperature of 150°C at a speed of 22 mm/second (prepreg lamination time: 14 seconds) with the same wrapping width, while heating both sides of the prepreg at 150°C using an infrared heater immediately before wrapping the prepreg around the substrate, and then heating was continued for 90 seconds to obtain a molded article (1).
• the temperature of the wound prepreg was 146 to 150°C.
• the obtained molded article (1) had an interlaminar shear strength of 37 MPa.
• thermosetting prepreg (1) having a width of 300 mm obtained in Production Example 1 was wound 30 times around a pipe having a diameter of 100 mm and a width of 500 mm at a temperature of 150°C at a speed of 67 mm/second (prepreg lamination time: 5 seconds) with the same wrapping width, while heating both sides of the prepreg at 150°C using an infrared heater immediately before wrapping the prepreg around the substrate, and then heating was continued for 90 seconds to obtain a molded article (2).
• the temperature of the wound prepreg was 146 to 150°C.
• the obtained molded article (2) had an interlaminar shear strength of 52 MPa.
• thermosetting prepreg (1) having a width of 300 mm obtained in Production Example 1 was wound 30 times around a pipe having a diameter of 100 mm and a width of 500 mm at a temperature of 150°C at a speed of 125 mm/second (prepreg lamination time: 3 seconds) with the same wrapping width, while heating both sides of the prepreg at 150°C using an infrared heater immediately before wrapping the prepreg around the substrate, and then heating was continued for 90 seconds to obtain a molded article (3).
• the temperature of the wound prepreg was 146 to 150°C.
• the obtained molded article (3) had an interlaminar shear strength of 42 MPa.
• thermosetting prepreg (2) having a width of 300 mm obtained in Production Example 2 was wound 30 times around a pipe having a diameter of 100 mm and a width of 500 mm at a temperature of 150°C at a speed of 125 mm/second (prepreg lamination time: 3 seconds) with the same wrapping width, while heating both sides of the prepreg at 150°C using an infrared heater immediately before wrapping the prepreg around the substrate, and then heating was continued for 90 seconds to obtain a molded article (4).
• the temperature of the wound prepreg was 146 to 150°C.
• the obtained molded article (4) had an interlaminar shear strength of 32 MPa.
• thermosetting prepreg (2) having a width of 300 mm obtained in Production Example 2 was wound 30 times around a pipe having a diameter of 100 mm and a width of 500 mm at a temperature of 120°C at a speed of 67 mm/second (prepreg lamination time: 5 seconds) with the same wrapping width, while heating both sides of the prepreg at 120°C using an infrared heater immediately before wrapping the prepreg around the substrate, and then heating was continued for 120 seconds to obtain a molded article (5).
• the temperature of the wound prepreg was 116 to 120°C.
• the obtained molded article (5) had an interlaminar shear strength of 38 MPa.
• thermosetting prepreg (1) having a width of 300 mm obtained in Production Example 1 was wound 30 times around a pipe having a diameter of 100 mm and a width of 500 mm at a temperature of 150°C at a speed of 9 mm/second (prepreg lamination time: 35 seconds) with the same wrapping width, while heating both sides of the prepreg at 150°C using an infrared heater immediately before wrapping the prepreg around the substrate, and then heating was continued for 90 seconds to obtain a molded article (R1).
• the temperature of the wound prepreg was 146 to 150°C.
• the obtained molded article (R1) had an interlaminar shear strength of 11 MPa.
• thermosetting prepreg (1) having a width of 300 mm obtained in Production Example 1 was wound 30 times around a pipe having a diameter of 100 mm and a width of 500 mm at a temperature of 150°C at a speed of 2 mm/second (prepreg lamination time: 157 seconds) with the same wrapping width, while heating both sides of the prepreg at 150°C using an infrared heater immediately before wrapping the prepreg around the substrate, and then heating was continued for 90 seconds to obtain a molded article (R2).
• the temperature of the wound prepreg was 146 to 150°C.
• the obtained molded article (R2) had an interlaminar shear strength of 2 MPa.
• a test specimen having a width of 10 mm and a length of 20 mm was cut out, and, with respect to the test specimen, an interlaminar shear strength was measured in accordance with JIS K7078, and evaluated according to the following criteria.
• Comparative Examples 1 and 2 which are examples in which the time taken to form the next layer of the thermosetting prepreg on the wound thermosetting prepreg layer is longer than the gel time of the prepreg at the temperature of the wound thermosetting prepreg, it was found that the molded articles had poor interlaminar shear strength.

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• 2018
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